diff options
Diffstat (limited to 'src/devices/bus/msx/cart/arc.cpp')
-rw-r--r-- | src/devices/bus/msx/cart/arc.cpp | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/src/devices/bus/msx/cart/arc.cpp b/src/devices/bus/msx/cart/arc.cpp new file mode 100644 index 00000000000..89508f853a9 --- /dev/null +++ b/src/devices/bus/msx/cart/arc.cpp @@ -0,0 +1,78 @@ +// license:BSD-3-Clause +// copyright-holders:Wilbert Pol +#include "emu.h" +#include "arc.h" + +namespace { + +class msx_cart_arc_device : public device_t, public msx_cart_interface +{ +public: + msx_cart_arc_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) + : device_t(mconfig, MSX_CART_ARC, tag, owner, clock) + , msx_cart_interface(mconfig, *this) + , m_7f(0) + { } + + virtual std::error_condition initialize_cartridge(std::string &message) override; + +protected: + // device_t implementation + virtual void device_start() override ATTR_COLD; + virtual void device_reset() override ATTR_COLD; + +private: + void io_7f_w(u8 data); + u8 io_7f_r(); + + u8 m_7f; +}; + +void msx_cart_arc_device::device_start() +{ + save_item(NAME(m_7f)); + + // Install IO read/write handlers + io_space().install_write_handler(0x7f, 0x7f, emu::rw_delegate(*this, FUNC(msx_cart_arc_device::io_7f_w))); + io_space().install_read_handler(0x7f, 0x7f, emu::rw_delegate(*this, FUNC(msx_cart_arc_device::io_7f_r))); +} + +void msx_cart_arc_device::device_reset() +{ + m_7f = 0; +} + +std::error_condition msx_cart_arc_device::initialize_cartridge(std::string &message) +{ + if (!cart_rom_region()) + { + message = "msx_cart_arc_device: Required region 'rom' was not found."; + return image_error::INTERNAL; + } + + if (cart_rom_region()->bytes() != 0x8000) + { + message = "msx_cart_arc_device: Region 'rom' has unsupported size."; + return image_error::INVALIDLENGTH; + } + + page(1)->install_rom(0x4000, 0x7fff, cart_rom_region()->base()); + page(2)->install_rom(0x8000, 0xbfff, cart_rom_region()->base() + 0x4000); + + return std::error_condition(); +} + +void msx_cart_arc_device::io_7f_w(u8 data) +{ + if (data == 0x35) + m_7f++; +} + +u8 msx_cart_arc_device::io_7f_r() +{ + return ((m_7f & 0x03) == 0x03) ? 0xda : 0xff; +} + +} // anonymous namespace + +DEFINE_DEVICE_TYPE_PRIVATE(MSX_CART_ARC, msx_cart_interface, msx_cart_arc_device, "msx_cart_arc", "MSX Cartridge - Arc") |